Gaia Data Release 1 - The Cepheid & RR Lyrae star pipeline and its application to the south ecliptic pole region

Abstract

We present an overview of the Specific Objects Study (SOS) pipeline developed within the Coordination Unit 7 (CU7) of the Gaia Data Processing and Analysis Consortium (DPAC), the coordination unit charged with the processing and analysis of variable sources observed by Gaia, to validate and fully characterise Cepheids and RR Lyrae stars observed by the spacecraft. We describe how the SOS for Cepheids and RR Lyrae stars (SOS Cep&RRL) was specifically tailored to analyse Gaia's G-band photometric time-series with a South Ecliptic Pole (SEP) footprint, which covers an external region of the Large Magellanic Cloud (LMC). G-band time-series photometry and characterization by the SOS Cep&RRL pipeline (mean magnitude and pulsation characteristics) are published in Gaia Data Release 1 (Gaia DR1) for a total sample of 3,194 variable stars, 599 Cepheids and 2,595 RR Lyrae stars, of which 386 (43 Cepheids and 343 RR Lyrae stars) are new discoveries by Gaia. All 3,194 stars are distributed over an area extending 38 degrees on either side from a point offset from the centre of the LMC by about 3 degrees to the north and 4 degrees to the east. The vast majority, but not all, are located within the LMC. The published sample also includes a few bright RR Lyrae stars that trace the outer halo of the Milky Way in front of the LMC.

arXiv comment36 pages, 45 figures, 4 tables. Accepted for publication on A&A. A full version with higher resolution figures and the complete atlas of light curves can be found at this link: http://davide2.bo.astro.it/~felix/ The manuscript is part of the series of DPAC papers that accompany Gaia DR1

References in corpus (20)

• The Gaia mission
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• Gaia broad band photometry
• Horizontal Branch Stars: The Interplay between Observations and Theory, and Insights into the Formation of the Galaxy
• Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys
• A multi-color and Fourier study of RR Lyrae variables in the globular cluster NGC 5272 (M3)
• Cepheid pulsation models at varying metallicity and DY/DZ
• Exploring the Variable Sky with LINEAR. II. Halo Structure and Substructure Traced by RR Lyrae Stars to 30 kpc
• Discovery of $\sim$ 9,000 new RR Lyrae in the Southern Catalina Surveys
• RR Lyrae stars in Galactic globular clusters.III. Pulsational predictions for metal content Z=0.0001 to Z=0.006
• The EPOCH Project: I. Periodic variable stars in the EROS-2 LMC database
• Gaia data release 1: Principles of the photometric calibration of the G band
• Finding, characterizing and classifying variable sources in multi-epoch sky surveys: QSOs and RR Lyrae in PS1 3$\pi$ data
• New RR Lyrae variables in binary systems
• The VMC Survey - X. Cepheids, RR Lyrae stars and binaries as probes of the Magellanic System's structure
• Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE
• Standard candles from the Gaia perspective
• The OGLE Collection of Variable Stars. Over 45 000 RR Lyrae Stars in the Magellanic System

Cited by in corpus (55)

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• A re-classification of Cepheids in the Gaia Data Release 2
• Piercing the Milky Way: an all-sky view of the Orphan Stream
• Clouds, Streams and Bridges. Redrawing the blueprint of the Magellanic System with Gaia DR1
• Gaia Data Release 1. Testing the parallaxes with local Cepheids and RR Lyrae stars
• Gaia DR3: Specific processing and validation of all-sky RR Lyrae and Cepheid stars -- The Cepheid sample
• The VMC survey - XXVI. Structure of the Small Magellanic Cloud from RR Lyrae stars
• Gaia Data Release 2: Summary of the variability processing & analysis results
• Aurigaia: mock Gaia DR2 stellar catalogues from the Auriga cosmological simulations
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• Gaia Data Release 2: All-sky classification of high-amplitude pulsating stars
• The period-luminosity and period-radius relations of Type II and anomalous Cepheids
• Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey: I. HARPS-N@TNG spectroscopy of 47 Classical Cepheid and 1 BL Her variables
• Observational calibration of the projection factor of Cepheids - III. The long-period Galactic Cepheid RS Puppis
• The VMC Survey -- XLVIII. Classical Cepheids unveil the 3D geometry of the LMC
• Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves: I. Period-Fourier-Metallicity Relations for Fundamental Mode RR Lyrae
• CHES: a space-borne astrometric mission for the detection of habitable planets of the nearby solar-type stars
• The ISLAnds Project III: Variable Stars in Six Andromeda Dwarf Spheroidal Galaxies
• Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane
• Gaia RR Lyrae Stars in Nearby Ultra-Faint Dwarf Satellite Galaxies
• Cepheid Metallicity in the Leavitt Law (C- MetaLL) survey: II.High-resolution spectroscopy of the most metal poor Galactic Cepheids
• The fast transient sky with Gaia
• A theoretical framework of BL Her stars. I. Effect of metallicity and convection parameters on period-luminosity and period-radius relations
• RR Lyrae mid-infrared Period-Luminosity-Metallicity and Period-Wesenheit-Metallicity relations based on Gaia DR3 parallaxes
• Metallicity of Galactic RR Lyrae from Optical and Infrared Light Curves: II. Period-Fourier-Metallicity Relations for First Overtone RR Lyrae
• A fresh look at the RR Lyrae population in the Draco dwarf spheroidal galaxy with Gaia
• Short timescale variables in the Gaia era: detection and characterization by structure function analysis
• Near-IR period-luminosity relations for pulsating stars in $\omega$ Centauri (NGC 5139)
• Empirical completeness assessment of the Gaia DR2, Pan-STARRS 1 and ASAS-SN-II RR Lyrae catalogues
• First stellar occultation by the Galilean moon Europa and upcoming events between 2019 and 2021
• The RR Lyrae projected density distribution from the Galactic centre to the halo
• Light propagation in 2PN approximation in the field of one moving monopole: I. Initial value problem
• Potential asteroid discoveries by the ESA Gaia mission: Results from follow-up observations
• Periods and classifications of RR Lyrae stars in the globular cluster M15
• A hierarchical Bayesian model to infer PL(Z) relations using Gaia parallaxes
• Multivariate Time-series Analysis of Variable Objects in the Gaia Mission
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• Gaia Data Release 2: Specific characterisation and validation of all-sky Cepheids and RR Lyrae stars
• Variability search in M 31 using Principal Component Analysis and the Hubble Source Catalog
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• The VMC Survey -- LIV. Anomalous Cepheids in the Magellanic Clouds Period-Luminosity relations in the near-infrared bands
• On the impact of Helium abundance on the Cepheid Period-Luminosity and Wesenheit relations and the Distance Ladder
• Testing ultralow amplitude Cepheid candidates in the Galactic disk by TESS and Gaia
• Pulsating star research and the Gaia revolution
• Cepheid Metallicity in the Leavitt Law (C-MetaLL) survey: IX. Metallicity dependence of Period-Wesenheit relations based on a homogeneous spectroscopic sample
• Reconsidering The Bailey Diagrams of ab-type RR Lyrae Stars, Metallicity-Mediated Evolution as the Direct Cause of the Oosterhoff Phenomenon
• Gaia's Cepheids and RR Lyrae Stars and Luminosity Calibrations Based on Tycho-Gaia Astrometric Solution
• Cepheids with the eyes of photometric space telescopes